天然气运移物理模拟实验及其组分分异与碳同位素分馏特征  

PHYSICAL SIMULATING EXPERIMENT OF NATURAL GAS MIGRATION AND ITS CHARACTERISTICS OF COMPOSITION DIFFERENTIATION AND CARBON ISOTOPE FRACTIONATION

作　　者：史基安[1] 孙秀建 王金鹏[1] 王琪[1] 王雷[1] 

机构地区：[1]中国科学院兰州地质研究所气体地球化学重点实验室,兰州730000

出　　处：《石油实验地质》2005年第3期293-298,共6页Petroleum Geology & Experiment

基　　金：中国科学院知识创新工程重要方向项目(KZCX3-SW-128);国家自然科学基金项目(40272065;40072050);国家重点基础研究发展规划项目(G1999043310)。

摘　　要：天然气运移物理模拟实验结果表明,天然气在运移过程中将发生组成的色层效应和分馏现象。天然气中甲烷等轻组分的渗透运移速度较大,粘土矿物对天然气中重烃组分具有较强的束缚能力,而且在不同输导层中正构烷烃和异构烷烃的运移速率存在着明显差别。实验结果还表明,运移可以造成天然气烃类气体碳同位素的分馏,特别是天然气中甲烷碳同位素对运移条件及过程较为敏感。Comparing with petroleum, natural gas is more active, and its accumulation and dissipation are more complex. In this paper, the characteristics of composition differentiation and carbon-isotope fractionation of natural gas in different carrying beds in migration are discussed according to the result of physical simulating experiment, and the influence of different carrying beds characteristics to natural gas is studied. The result of physical simulating experiment shows that chromatographic effect and fractionation of composition will take place when hydrocarbon migrating. The light-hydrocarbon composition in natural gas, such as methane, has relatively high permeability and migrating velocity. Clay minerals have more powerful bounding force to heavy-hydrocarbon composition than to light composition, and the migration velocities of normal paraffin hydrocarbons and isoalkines in different carrying beds are obviously different. The experimental result also shows that migration can cause the fractionation of carbon isotope of natural gas, and methane carbon isotope is comparatively sensitive to migration conditions and processes.

关 键 词：天然气运移 物理模拟 甲烷碳同位素 

分 类 号：TE122.1[石油与天然气工程—油气勘探]